From: richard.zhao@linaro.org (Richard Zhao)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/2] dma/imx-sdma: add wmb before enable a channel
Date: Sun, 1 Jan 2012 22:38:12 +0800 [thread overview]
Message-ID: <1325428692-11473-3-git-send-email-richard.zhao@linaro.org> (raw)
In-Reply-To: <1325428692-11473-1-git-send-email-richard.zhao@linaro.org>
dma_alloc_coherent memory may be bufferable. We need to add
nececcary memory barrier.
Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
---
drivers/dma/imx-sdma.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index f8e87b5..9301bff 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -394,6 +394,7 @@ static int sdma_config_ownership(struct sdma_channel *sdmac,
static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
{
+ wmb();
__raw_writel(1 << channel, sdma->regs + SDMA_H_START);
}
--
1.7.4.1
next prev parent reply other threads:[~2012-01-01 14:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-01 14:38 [PATCH v2 0/2] imx-sdma: memory barrier fix Richard Zhao
2012-01-01 14:38 ` [PATCH v2 1/2] dma/imx-sdma: let sdma_run_channel call sdma_enable_channel Richard Zhao
2012-01-01 14:38 ` Richard Zhao [this message]
2012-01-03 17:46 ` [PATCH v2 2/2] dma/imx-sdma: add wmb before enable a channel Russell King - ARM Linux
2012-01-04 2:31 ` Richard Zhao
2012-01-05 1:56 ` Richard Zhao
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